Research Article
A Rolling Bearing Fault Diagnosis-Optimized Scale-Space Representation for the Empirical Wavelet Transform
Figure 26
Results obtained by the traditional EWT: (a) SSP (green dashed line: the detected threshold by k-means clustering); (b–d) sub-band signals; (e) detected boundaries (green dash-dotted lines); (f–h) squared envelope spectra (red dashed lines: fBPFO and its harmonics; red dash-dotted lines: fBSF and its harmonics).
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